Concentrator



w. P. OGDEN, DECD. M. E. HULMB, ADMINISTRATHIX. CONCENTRAOR.

APPLICATION FILED JAN. i5, l|919.`

13285392, i Patent-Gasen. 5, 1922.

12 sursis-snip n.

W. P. OGDEN, DECD. M-IE. HOLMES, ADMINISTHATRIX. cowcewmmoa. APPLICATION FILED HLN- |5, [919.` 154282392. PatentedSept. 5, 1922.

, A TORNEYS.

W'. P. OGDEN, DECD.

CONCENTHATR. n v Arme/mou msn um. l5. 1919. l 428,392., 4 Patentedsept 5, 1922.

t t l2 Snifsisufz s. l y 3. o w l F 5 io o I v P u PB E? P i 'Q e U U T1 o 45 BY ZA? A TTORNE YS w. P. OGDEN, DECD. M. E. HOLMES; ADMINISTRATMX.

CONCENIRATDR.

APPLxcATloN FILED JAN. 15, 1919.

2 Wm 1N E l LUIS Pn er.. Sw Mz. w Lm P INVENTOR.

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ma/Jz Y KMA TToRNEYs.

w. P-. oGnE-N, DEcfn.

M. E. MMMMMMMMMMMMMMMMMMMM X.

= CONCENTRATOH.

y APPucA'now FILED uw. 15, |919. 1,428,392. Patenwd Sept. y5, 1922.

v BY l M ATToRNEYs.

Sept. 5, 1922. MEETS-SHEET u.

M/amgww WMTORNEYS.

W. P. OGDEN, DECD. M. E. HoLMEs, ADMINISTRATRI W. P. OGD'EN, DECD. M. s. nomeehnmmsrvnmmx.

CONCENTHATOR. APPLlcAneN mfn'mmxs. me.

Patented Sept. 5,1922.

ATTORNEY Patented Sept. 5, i922.

natif tiff? ,risas WILLLAM r. OGDEN, nEeEAsEn, LATE 'or' DENVER, COLORADO, BY MAUDE E. HOLMES, v

iiiiiviiNIsainfiriaiii, orA sroKANE, WASHINGTON, ASSIGNOR'TO J. sortirait'- TERLY, OF SPOKANE, VJASHINGTON.

CONCENTRATOR.

Application led` January 15, 1919.' Seriali NOL27T13316.

To all w/"wml it. may concern:

Be it known that the undersigned, Manon E. HoLMEs, a citizen `of the UnitedStates of -America, residing at Spokane, inthe county of Spokane and State of-Washing lton, is the administratrix of the estate of TViLLLiM P. OGDEN, deceased; that thesaid 'liLLiAM P. OGDEN was a resident of Denver, of they county OfDenver and State of Colorado; that he is now deceased; and that during his lifetime he invented new and `useful Improvements in Concentrators, yof

vrubiesy may be'separated and concentrated by the hydraulic process and the assistance.-

Of gravity without the use :of Amercury or other amalgam, whereby theifreegoldand platinum are prepared for the mint, the black 'sand for the smelterl and the rubies `separated `for commercial purposes. This process has valready been and now is being used for the above purposes in one complete plant. The same may-be altered to concentrate tailings from a crushingl orfgrinding .plant and treat placer containing any one or lany combination ofthe properties above named. The same process may be used for J the valuable minerals from quartz where the same is ground Oi' crushed so that the properties will separate.

ri'ihere are many phases of the construction that-cannot well be especially referred to in a preliminary statement` but, generally speaking, the construction and; processiconsists generally in providing a sutiicientfhead of water, means for conveying the placery or other material to .ithe water,` providing a flume into which the placer orothermaterial and the water is turned, the providingfof giiyialies part wayv upithe' fiume and valong` the saine, of different dimensions, whereby a current of water runs along, under :and i over the grizzlies, such -grizzlies being* of different sizes and spaceda'd-goining each along the flumeU-anclfat jdifferent distances andto separate the different grades of rubies .and illustratedlin .the accompanying `drawis used-and in whic .plant forgeneral reference purposes to" show the relative positions-,of the different-,ele-

. from thefiioor of the flume, the elevation of I the :floor beingy adjusted to meet the variations in'thefrequired distances between the grizzlies and `the floors iny accordance with the size of the grizzlies and their location Ainthe flume.' Toprovide means for taking from the flume for separate treatment the materials contai-ningfthe black sand, l fine gold, platinum or other valuable mineral, the vsame` beingl passed through? the` smaller ygrizzlies and' carrying the -material containing the coarse gold, platinum and rubies farther along 'the flume. whereitis passed through larger grizzlies and'taken from the fiume fon-separate; treatment;y to provide means for separating' the grayA sand from the black sand and said other finer grained.

`:mineral values,:to separate said black sand from the finer grained "Valuesand to finally clean said xfiner vgrained valuesfor the 'mint and lto store the blaclrsand forsmelter treatment.. To provide means for separating the coarser particles of minerals 'from therubies 5 for commercial purposes7 and finally dispos- 'of-the tailings. y

-The dftailed construction and operation ofthe parts will be hereinafter;described ings of a plant constructedalong the general 'lines mentioned, in which afdouble flume Y s Figure l, isf a diagrammatic.view,1 of a ments enteringgenerally intoithe construction ,and toi which reference will generally be hereafter had. l

Figure 2, is aibroken-away sectional plan view of the larger'lilumev showingthe draw- Y.off gates open.

' Figure `3, 'of the smallerffinit-rie',` showing the draw-oft1 gates closed.

' Figure et; is a broken-away side elevation 95 of the flume.

- Figure-5,`is a .cross-section ofthe. two lunies together,witli a subjacentlume for carrying 'the -fmaterialsf Adrawn 'oflvf through gates in the bottoms of the -flumes pforfur-y ,l0

ther treatment. ,l

' Figure 6, is a lbroken-away plan -view fof a separator and distributing flume used in the treatment of the iner particles of minerals and the black sand.

Figure 7, is a sectional View taken on the line 7-7 of Figure 6.

Figure 8, is a sectional View taken on the line 8 8 of Figure 6.

Figure 9, is a sectional View taken on the line 9-9 of Figure 6.

Figure 10, is a broken-away bottom View7 of Figure 9, illustrating the construction of the gate guide.

Figure 11, is a sectional View taken on the line 11.-11 of Figure 9.

Figure 12, is a top plan View of a brokenaway portion of the separator iiumes and concentrating tables, the tables being ar ranged in pairs i'or convenience of operation.

Figure 13, is a projected end View of Figure 12.

Figure 14, is a side elevation of Figure 12.

Figure 15, is a plan View of one of the concentrating tables with the baffles removed.

Figure 16, is a side elevation of the same.

Figure 17, is a longitudinal sectional View taken on the line 17-17 of Figure 15.

Figure 18, is an upper end View of Figure 15.

Figure 19 is a sectional View taken on the line 19-19 of Figures 15, 16 and 17.

Figure 20, is a broken-away plan View of one of the concentrator tables With the baffles attached and showing the manner of attaching the balles.

Figure 21, is a projected end vienT of Figure 20.

Figure 22, is a plan View of av table attached to the head of the concentrating tables and carrying an adjustable spreader" and showing the manner of attachment to the concentrating tables.

Figure 23, is a side View of the same.

Figure 24, is a sectional View taken on the line 24-24 of Figure 22.

Figure 25, is a broken-away plan View of a separator table used for separating line and flake gold from black sand.

Figure 26, is a projected end View of the same.

Figure 27, is a sectional View taken on the line 27-27 of Figure 25.

Figure 28, is a broken-away plan View of the linal cleanup table of the iine and flake gold.

Figure 29, is a. projected end View of the same.

Figure 30, is a sectional View talren on i the line 30-30 of Figure 28.

Figure 31, is an end vier7 of a bolster supporting the head end of the final cleanup table for tine and lake gold.

Figure 32, is a side elevation of the table with some of the supporting mechanismi broken-away.

Figure 33, is an end View of the bolster used to support the tail of the table.

lligure 34, is an end View of the table and bolster showing means for adjusting the end of the table.

Figure 35, is a broken-away top plan View of the table.

Figure 36, is a plan View of a Hungarian ritlle used to take up and hold all oi the coarse gold and the rubies.

Figure 37 is an enlarged longitudinal sectional View of the same.

Figure 38, is a broken-away cross-sectional View of the same.

Figure 39, is a plan View of a brokenaway portion of larger rilfles for catching coarse gold.

Figure 40, is a longitudinal sectional View of the same.

Figure 41, is a cross-sectional View taken on the line 41-41 of Figure 40. l

Figure 42, is a plan View of a riiile for catching coarse gold of somewhat smaller dimensions than that disclosed by Figures 39 to 41 inclusive.

Figure 43, is a longitudinal sectional View of the same.

Figure 44, is a cross-sectional View taken on the line 44-44 of Figure 43.

Figure 45, is a broken-away plan View of a riflle for catching the large rubies.

Figure 46, is a longitudinal sectional View of the same.

Figure 47, is a cross-sectional View of the same taken on the line 47-47 of Figure 46.

Figure 48, is a broken-away plan View or a riflle for catching the smaller rubies.

Figure 49, is a longitudinal sectional View of the same. v

Figure 50, is a cross-sectional View taken on the line 50-50 of Figure 49.

Figure 51, is a broken-away plan View of a lg inch grizzly over Which the placer or concentrates pass.

Figure 52, is a longitudinal sectional View i' the same.

Figure 53, is a broken-away plan View of a inch grizzly over Which the placer or concentrates pass after being treated by the -llg inch grizzly.

Figure 54, is a longitudinal sectional View of the same.

Figure 5,5, is a broken-away plan View of a one inch grizzly over which the placer or concentrates pass after being treated by the g and grizzlies.

Figure56, is a longitudinal sectional View of the same.

Figure 57, is a broken-away plan View of a three inch grizzly over Which the placer or concentrates pass after being treated by the lg, J2- and one inch grizzlies.`

Figure 58, is a longitudinal sectional view of the same. f i

Figure 59, is a broken-away plan `view of the riffles of the nal cleanup tabler Figure 60, is'a' projected end view of the same, and i Figure-61, is a longitudinal sectional view. of the same.

Ina detail description in which lke'ntu merals refer to like parts throughout the several views, attention is irstcalledV to Figure 1,V the same being a diagrammatic view and upon which will be indicated thel relative locations of the different elements entering into the construction and .which are shown in detail upon other iigures. The main fiume is indicated by 10 and vthe iiow of the water and material is in the direction of the arrows marked therein. Drawotfs 11 leading from the bottom of the flume 10 connect with a conveyor 12 leading 'to a separator vflume 13, broken-away views of which are shown in Figures 6, 7, 8, 9, 1() and 11, and baiiles of which are vshown yin Figures 28, 29 and 30, from the bottom of which are drawoffs 14 leading to concentrating tables 15, views of which are shown in Figures 15 to 21 inclusive, andbaflies in Figures 28, 29 and 30, from which are drawoifs" 16 lea-ding toa vilume 17 `in which is'installed ritiles 18 shown in Figures 25, 26 and 27 In the iiume at the lower end of the baffles 18 is a drawotl 19 leadingto final (cleanup table 20, carrying battles 2l which areshown in Figures 59, 6() and 6l. Connected with the separator fiume 13Xis a conveyer Hume 22 leading to a launder flume 23 which is ralso adapted to receive the over-flow fronithe concentrating tables 15. 4Connected with the final cleanup table 21`is af'conveyer flume 24 leading to a bin 25. The flumes 17 and 23 connect with a bin 26. Leading'fromthe fiume 17 isa conveyer fiume 27 connecting with the tail 10ZL ot the main flume 10. From point 10" to`10c in the main flume 10 are linstalled the lg inch grizzlies, broken-away views 'of which are lshown in Figures 51 and 52. From point 1()c to v10d in the main Afiume are installed the ginch grizzlies, brokenaway views of which are shown in Figures 53 land 5a.A A' From point 10d tol 1()e in the main flume Al() arel installed one'inch grizzlies, broken-away views of which are shown in Figures 55 and 4k56. From point 10e to `10f in the main `flume 10 ware. in'- stlalled 3 inch grizzlies,`brol {enaway views of which are shown in Figures 57 andy 58. 'From the bottom of the iiume 1() at the location of the inch and one inchV grizzlies aredrawcifs 28 leading to a conveyer flume 29 leading to a table 30 on which are installed tine .sets of bellies, spaced in the following order. 'F rom point 30a to 30b is installed` Hungarian ritlles',

`shown in Figures 36,37 and 38. f point 30b to 30C is installed gold From n ritlies shown in Figures 39,40 and' 41. From to 30d is installed gold shown in` Figuresk 42, 43 and 44;' point 30d to 30e is installed'ruby shown in Figures 45,46 and 47. point 30P to `3Of is installed ruby riflies shown in Figures 48, 49 and 50. From vthe bottom of the main fiume 10 where the From riiiies three inch grizzlies are installed isa draw-'- off -31 leading to a table '32 on which is --ritliesg From.

installed Hungarian rifles 33 show-n Figures 36, 37 andv 38.v A oonveyer flume 3-l y leads from thetable 32 and a conveyerlume 35 from the table'30, each connected witha flume 36 leading tothe tail'10L ofthe main lumelO.

Reference will now be .had Yto .Figures i 2, 3, 4 and 5 wherein is. detailed and enlarged thek constructionl of the main fiume l0.4 VTWhile in the diagrammatic `view (Figs ure 1) only one flume is'indicated,yet in ,l

practice` it hasbeen `found advisable to have two liumes, one of largerdimensionlfs than the other, so that when the water supply is great theqlarger dunnel can be 'used and when the supply oi wateris limited,

the smaller' flume can, be used. The-views above, referred to show two"liimes,fthe larger one 10 and ,a smaller one-37. The

two'tlumes arev shown paralleling eachother and mounted on thel same supports 38, the side walls`39 beingbound togetherat-the top by cross-girders, 40. Longitudinal guides i-1 follow the outside walls y39011 top of the ycrossagirders i0 and rods 42connect the same with base supports a3; The

floor 4A. of the flumes is surmounted by longitudinal girders 4l5yupon which are mounted transversely ot the tlumes, timbers 46, spaced apart toctorm grizzlies'. Spaced alongk the ilumes 10 and 37 and horizontal therewith' are separate gates l between thegirders 45., `llhese gates are slidably .adjusted by the rotation of a rod or pipe i8 towhich they are securedv by means of cables 49, the rod or pipe' 43 being manually rotated by means of a lever 50 attached thereto. ported by horizontally 'arranged guides 1 The gates 4,-7 connect with the draw-oils 11 which lead tothe flume 12.v A plate 52 covers the connection of the gates witlrtliev` 12o `1,428,392 y 1 t I. 5

larged detail in Figures 39, 40j` and 41. From the point c to 30d on the table 30 are installed gold rittles 119, shown inl enlarged detailin'Figures ,42, 43 and 44'. From the point 30d to 30e on vthe table 30 are installed ruby ritlles 1,20, shown in enlarged detail in Figures 45, 46 and 47. vFrom thepoint 30e to 30f, on the table 30, are installed ruby ritlies 121, shown in enlarged detail in Figures r48, 49 and 50. M

, In the practical operation'of the separator which, as heretofore stated, is 4to separate coarse, tine and Hour gold, platinum, large and small rubies and black sand carrying gold from gravel vand sand by strictly a gravity process and 'Which isdone by the mechanism hereinbefore particularly 4described, the main Hume 10 is set on an angle of' 10 inches toV 12 feet, the sidev fiume 12 being on the samegrade. The separator ume 13 is set on an angle of 8 inches to 1,2 ieet. The flumes 17 and 23 are set on an angle of 2 inches to 1 foot. The tablel 2O is adjustable and used at an` angley varying from approximately level to 2 inches to 1 foot. The portion 12? of the iiume 12 connecting With the separator flume 13 is calculated 'for rapid conveyance, also the conveyer flume 22 leading from the separator' flume 13 to the flume 23.` y'The tables 30 and 32 are set on an angle of approximately 2 `inches to 1 foot. AThese tablesarer adjustable so that the angle may be varied to meet the conditions .and to get the' desired results. A head of Water andthe material to be treated are turned into the head of the flume 10 (Figure 1), llingthe space between the girders 45 (Figure 5) and over the grizzlies 113.130 a depth of from two to three feet it' desired. While passing over thefff grizzlies 11,3, the black sand, the fine gray sand and the line gold pass downwardly through the grizzlies 113 to and through the spaces between thegirders 45 tothe draW-oii`s 11,v from Where the same reaches the iume .12,`

passes through the portionf12a'v`to the distributor flume 13. The flume 13.' has mounted therein rubber ritlles 93vshoWn in enlargedviewin Figure 28." By the aid of these riii'les and ythe flow of the Water about sixty per cent ot thev gray sand is Washed out and passes through the flume 22 (Figure `1) to the Hume 23. The remaining material is .Washed into the lchannel 53 (Figures `6 and l8) and there distributed throughythe draw-offs 14 to lthe 'concentrating tables 15 set rubber ri1lles'93v shown in Figure 28. These ritlies with the aid of the flow-o'f'ivater causes the black sand and ne goldto gather in the riiiles and as the same accumulates toworlr doWnvva'rdly'along the riitles to the vlomgitudinal .channel 81 (Figures 15vtov 21A inclusive) `from Where the' same drawn jvaluesare -Wafs'hed for gathering off,"

off through .the` openings 16 to the iiume 17 "(Figure"1).. "'The gray sand that .has not been separated bythe flume 13'is mainly carriedl over the end' 152,(Figure 1) ofthe. tables 15 to thelflume 23'.' 1n the" flume 17 the ril-les 18 extractanclretain the fine gold,

and the black sand carrying values is `Washed over the same to thebin 26l Where' the same is incondition to be transported to a 'smelterfy for treatment. l The' goldl that remains in the gray sand thatgoes over the ends 15"L otv thetables 15 into the flume 23 is gathered by theri'l'l'les 18 in said flume. The gray. sand i in the flume 23 is carriedoflf a side iiurne 27 (Figure 1) leading to the tail lOc'of the `main flume 10. Fresh Water from al pipe 74 is constantly.runninginto'the'tables 15 through the connections `75, (Figures'12, 13 and 14), which aids in the separation yprocess."V rIhe gold that hasybeen gathered by the supply `of clean Water in a cleaning up process through a draw-off 19'to the table 20 Where' in by a supplyof Clearwater." Thiss'ection of the flumeV is tiltablyT adjustable, so .that thev goldisyvashed to one` side ot the flume rthe riitles 21 ,gather` thesame'and` the'san'ie iswashed clean by the said supply yof clean 'Water yfor the "mint, The` gold gathered by` v the riflles 18 in the fiume 23is'washed there# and there manually gathered.r As the `maextract from.' the material in the main Hume 10, the coarser geld, rubies 'and'platinum,` the same passing throughtheldraW-otls 28 to the conveyer flume 29 to the table where the retaining riliies'33 .hold the coarse gold, rubies and ,platinum k'otsuch dimensions that the same 'did not pass through the ela-,inch grizzly. VThese values are retained the rilles 33 until such time pas it is'de! sired to make a" cleaneup of the' same'when the flow of material and 4Water ist'ur'ned oti `ro'ni theysanief1 and clear vWater supply turned onto the table'30 '.Whichwilhhave the following effect! EThe riflles 1.18 (Figures passing onto ritlies119(Figures 42,143 and f overgb'oth sets of these' ritlies to riiles120 n y f .and'121' (Figures 45 to 5() inclusive) Where Which .may be provided in" great number, and'which are provided Withthe diagonally *rifHes `121. Along one l"side 'of allfofthese ri'llesisj a' channel122 into WhichV all the The f3 inchfgrizzlies 116talr`eup largery pieces'ofrocl andthelike carrying sufficient quantitiesof valuablel mineral to cause the,

ieee tareas ."heffehregep by seria. the

"land 39 'to 41inclusiv`e) Will retainl the coarse'r` goldand rubies, the finer e particles 44) :Where they are heldg'the rubies passingl f 85 riifles 18 in the flume 17 is washedby a same passing 'through the draw-off 31 to the table 37 where the retaining riflles 33 (Figures 1 and 36 to 38 inclusive) take up the same. The launder flumes 34, 35 and 36 carry the waste and water into the end 10 of the main'flume 10, where the same is iscarded. y

ln actual practice we duplicate the tables in flumes 13,17 and 23, also duplicate the tables 30 and 32, and provide for turning the material from one set to the other so as to have a continuous treating` process going` on all of the time. lVhile one set of tables lis being cleaned up another set is gathering values. y

.fefe nring to Figures 6 to 11 inclusive and to lligures 12 to 14 inclusive, the gates 511 are regulated by means of levers 55 manually operated to govern the width'of the space for the outiow through the drawoffs 14. AThe over-lapping plates 60 prevent matey rials from washing inback of the gates 54.

Referring to Figure 60, a wedge 14159 extends longitudinally along the channel 112 and the riflle matting 21 is extended upwardly over lthe same as at 16.0. This prevents the concentrates from getting into the channel 112 until cleanup time, when the wedge 14:9 is removed, which causes the extension 160 to drop downwardly and into the channel 112 so that the concentrates can be washed into the channel 112..

llVhat is claimed is 1. A. gravity concentrator comprising a main flume, grizzlies at spaced intervals in the'flume and spaced above the floor thereof, a conveyor flume, drawofs leading from the bottom of the main flume beneath the grizzlies respectively, and connected with the conveyor flume, a distributor flume carrying bames connected to said conveyor flume, dra-Wolfs leading from said distributor flume and concentrating tables lconnected with said last mentioned drawoffs carrying` riffles for retaining blaclr sand and having an overflow for waste materials.

2. A gravity concentrator comprising la `main flume, grizzlies at spaced intervals in the flume and spaced above the floor thereof.v a-conveyor flume, drawoffs leadingl from lthe bottom of the main flume beneath the grizzlies respectively and connected with the conveyor flume, a distributor flume at rthe end of the conveyor flume having riffles and a longitudinally`arranged channel along one side thereof, a fresh water conduit leading thereto, concentrating tables, drawoffs leading from saidv channel to said concentrating tables, a fresh water conduit leading to said concentrator` tables', .said concentrator tables having riffles for retaining'black'sand and an overflow for waste materials.

3. A ygravity concentrator comprising a main fiume, grizzlies at spaced intervals in the flume and spaced abo-ve the floor thereof, a conveyor fiume, drawoffs leading from the bottom of the main flume beneath the grizzlies respectively and connected with the conveyor flume, a. distributor flume .connected with the conveyor flume and carrying riflles and having a longitudinally arranged channel along one side thereof, a fresh water conduit leading thereto, concentrating tables, drawofls leading from said channel to said concentrating tables, a fresh water conduit leading to said concentrator tables, said concentrator tables having riflles forr retaining black sand and anoveriow for waste materials, drawoft's leading from said concentrating tables to a receiving table having ri'l'illes and a longitudinal channel along one side thereof. Y

4. A gravityfconcentrator comprising va main flume, grizzlies 'at spaced intervals in the flume and spaced above the floor thereof, a conveyor flume, drawoffs leading from the bottom of the main flume beneath the .grizzlies respectively and connected. vwith the conveyor flume, a distributor flume carrying riffles and having a longitudinally arranged channel along one side thereof, a fresh water conduit leading thereto, concentrating table, drawoffs leadingfrom' said channel to the concentrating'tables, a fresh waterconduit leading to said concentrating` tables, said concentrating tables carrying rifl'les for retaining black sand and *having an overflow for waste materials, drawoffs leading from said concentrating tables to a receiving table having riffles and a longitudinally arranged channel at one side thereof, and a bin at the lower end of said receiving table. i p y 5. A gravity concentratorcomprising a main flume, grizzlies at spaced intervals in the flume and spaced above the floor thereof, a conveyor flume, drawolfs leading from the bottom of the main flume and beneath the grizzlies with the conveyor flume, a distributor' flume `.carrying riflles and having aI longitudinally arranged channel along one side thereof, a fresh water conduit leadingthereto, con

centrating tables, drawofls,l leading from said channel to the concentrating.tables, a fresh water conduit leading to said concentrating tables, said concentrating tables carrying riftles for lretaining black lsand and having an overflow for waste materials, drawoffs leading from said concentrating tables to a receiving` table having ri'lfles' and a longitudinally arranged channel along one side thereof, a finalclean up table'having riflies and a `drawoflI leading from said last named table and av bin at the lower end of said table.

` 6. A gravity concentrator comprising a main fiume, grizzlies at spacedintervals in the flume and spaced above the floor thereof, a conveyor flume, drawos leading from `respectively and connected l tables, drawoffs leading from said channelv to said concentrating tables, a fresh water conduit leading to said concentrating tables, said concentrating tables carrying riifles `for retaining black sand and having an overflow for waste materials, a conveyor Aflume leading from said distributor flume and a conveyor fiume leading from the concentrating table joined together and connected with a receiving table having riffles and a bin at the lower end of the table.

7. A gravity concentrator comprising a main uine, grizzlies at spaced intervals in the flume and spaced above the {ioor thereof, a conveyor fiume and drawoffs leading from near the entrance of the main fiume beneath the grizzlies respectively for drawing ofi sand and iine gold from the main flume, and concentrating tables connected with the conveyor flume drawoffs leading from the bottom of the main flume beneath the grizzlies respectively and beyond the first mentioned drawoffs for separating out coarse gold and rubies, a receiving table connected therewith having ritlles of different sizes at different places on said table adapted for retaining at different places on said table coarse and fine gold and large and small rubies.

8. A gravity concentrator comprising a main flume, conveyor fiume, concentrating tables and separators, drawos leading 'from the bottom of the main flume near the upper portion thereof and connected with the said conveyor fiume, concentrating tables and separators, and conduits leading from said concentrating tables and separators back to the main flume at the lower portion thereof, for carrying waste materials thereto.

9.` A gravity concentrator comprising a of, drawoffs leading from the bottom ofthe flume beneath the grzzlies respectively, a table having sets of rifiles at different places on said table adapted'for separately retaining at different places on said table coarse and line gold and large and small rubies,

connected with said main fiume by a .con-` veyorflnme into which said drawofislead; and a, table, having riffles adapted` for retaining' extremely large gold particles, said table being connected with said main fiume by a conveyor fiume into which said drawoffs lead, and a 'conveyor fiume'at the lower end of each of the two` last named tables connected with the lower end of the main flume for returning waste materials thereto.

l0. A gravity concentrator comprising a main flume, grizzlies at spaced intervalsr in the fiume and spaced above the fioor thereof, drawofls leading frpm the bottom of the' fiume beneath the grizzlies respectively and connected ywith a conveyor fiume leading to a distributing i'iuine, carrying riifles and having a longitudinally arranged channel along oneside thereof a fresh water conduit leading thereto, drawoffs leading from said channel to concentrating tables, afresh water conduit leading to said concentrator tables, said concentrator tables carrying riffles for retaining black sand and having an y overflow for waste materials, a conveyor and a conveyor' flume leading from the concentrating table ljoined vtogether and connected with a table having riilles, a bin.` at the lower end of the table, and a conveyor flume leading from said last named table and. connected with the lower end of the inain flume for returning waste materials thereto. X

ln testimony whereof, l affix my signature in the presence oftwo witnesses.

Marine n. i-ioLMns.

fldff'nz'n/stmtm'x 0j the estate of Willie/HLP.

Ogden, deceased. f j Witnesseszy MONICA B. THOMPSON, S. A. Dnnnnorr.A

30y flume leading fromv the distributor iiuine 

